Update to 4o-mini and use Azure AI Services

[ckittel]

• Update model from gpt35-turbo (Standard) to gpt-4o-mini (Standard)
• Replace direct Azure OpenAI deployment with Azure AI Services deployment
• A few minor Resource Manager API updates
• Update to a more strict content policy filter
• Remove key access to Azure Storage
• Add cors configuration for Azure Storage

[Copilot]

Pull Request Overview

This PR updates the deployment configuration to use the new gpt-4o-mini model and Azure AI Services instead of the previous gpt35-turbo and direct Azure OpenAI deployment. Key changes include updated connection and deployment names in the documentation, adjustments to the Resource Manager API usage, and updates to the Azure Storage configuration.

Files not reviewed (4)

• infra-as-code/bicep/machinelearning.bicep: Language not supported
• infra-as-code/bicep/main.bicep: Language not supported
• infra-as-code/bicep/openai.bicep: Language not supported
• infra-as-code/bicep/storage.bicep: Language not supported

Comments suppressed due to low confidence (1)

README.md:133

• The description still refers to 'Azure OpenAI instance' even after changing the connection name to 'azureaiservices_aoai'. Consider updating the description to 'Azure AI Services instance' for clarity and consistency.

- For **Connection**, select 'azureaiservices_aoai' from the dropdown menu. This is your deployed Azure OpenAI instance. 

[ferantivero]

great edits @ckittel LGTM 🚢